Social networking system

ABSTRACT

A networked computer system provides various services for assisting users in locating, and establishing contact relationships with, other users. For example, in one embodiment, users can identify other users based on their affiliations with particular schools or other organizations. The system also provides a mechanism for a user to selectively establish contact relationships or connections with other users, and to grant permissions for such other users to view personal information of the user. The system may also include features for enabling users to identify contacts of their respective contacts. In addition, the system may automatically notify users of personal information updates made by their respective contacts.

RELATED APPLICATIONS

This application is a division of U.S. application Ser. No. 12/127,495,filed May 27, 2008, which is a continuation of U.S. application Ser. No.11/022,089, filed Dec. 22, 2004, which is a division of U.S. patentapplication Ser. No. 10/780,486, filed Feb. 17, 2004 (now U.S. Pat. No.7,194,419), which is a continuation of U.S. patent application Ser. No.09/348,355, filed Jul. 7, 1999 (now U.S. Pat. No. 6,714,916), which is acontinuation of U.S. application Ser. No. 08/962,997, filed Nov. 2, 1997(now U.S. Pat. No. 6,269,369).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to multi-user computer systems,such as contact management systems, that provide services for users tolocate and share personal information with other users.

2. Description of Related Art

Several types of prior art for managing contact information exist,including Personal Information Management software applications,Groupware Applications, and Internet-based “White Pages” and e-mailservices.

Personal Information Management Software. As represented generally inFIG. 1, in a typical prior art Personal Information Management (PIM)software application (e.g., Lotus Organizer, Microsoft Outlook, or U.S.Robotics Palm Pilot), a PIM software application 120, 124 that storescontact information in a database resides on a workstation or handheldcomputer 100 having a central processing unit 102, a display 108, akeyboard and/or mouse 110, a primary memory 104 (e.g., random accessmemory) for program execution, a secondary memory 106 (e.g., a harddisc) for program storage, and peripheral devices 112. As is well known,programs, such as the PIM software 120, are executed in the RAM 104 bythe CPU 102 under control of the operating system software 122, 126.

In the prior art, users themselves enter the contact information thatthey want to store in the PIM software. A variety of methods exist forentering this contact information. It may be entered manually using thekeyboard, imported from an existing file on their computer, or importedvia a peripheral device such as a business card scanner. The definingcharacteristic of this class of prior art is that the input of thecontact information is performed by the user of the software and, whenthe information changes, the user must modify the information himself.What this class of prior art lacks is a means for information to beshared between multiple users and a means for a given user to postchanges to his own information for the benefit of others.

Groupware Applications. As generally represented in FIG. 2, in a typicalprior art Groupware application (e.g., Lotus Notes), a user workstation160 accesses information stored on a central server computer 130 over acomputer network 150, such as a Local Area Network or Intranet. Theserver system consists of a central processing unit 132, a primarymemory 134 (e.g., random access memory) for program execution, asecondary storage device 136 (e.g., a hard disc) for program storage,and a modem 138 or other device for connecting to the computer network.The user workstation 160 is the same as the user workstation 100described in reference to FIG. 1 with the addition of a modem 162 orother device for connecting to the computer network. The file server ordatabase contains data files 148 that can be accessed only by authorizedusers. The user uses client software 174, 176 running on the userworkstation 160 to access the files 148 under the mediation of serversoftware 140, 144 running on the server 130.

Typically, in such a system a central system administrator organizesusers into classes and the creator of a file 148 determines what classesof users may view the file. The rules governing which individual usersor classes of users have the authorization to view a particular file 148may be stored as part of the file itself. Alternatively, these rules arebased upon the hierarchical directory structure of the file server inwhich the file is stored. That is, a particular user may view files inone directory but not another.

FIG. 3 represents a common deployment of a contact management systembased on Groupware. Each user enters information 202 about himself andspecifies a set of permissions 204 that define what classes of users areable to view various pieces of the information 202. What this deploymentof the prior art lacks is the ability to authorize viewing privileges ona user-by-user basis rather than on a class-by-class basis. Forinstance, a user would be able to grant access to his home phone number206 to the Human Resources department of his employer (e.g., Class A)while denying access to the same information to his co-workers (e.g.,Class C). The user would not be able to give access to his home phonenumber selectively to a first co-worker while denying it to a secondco-worker if both co-workers were part of the same class of users asorganized by the central system administrator. Furthermore, such asystem would lack a practical notification methodology. There would beno way for a user to specify “notify me when the first co-worker changeshis information but not when the second co-worker changes hisinformation.”

Internet-Based “White Pages” and E-Mail Directory Services. In a typicalprior art “white pages” or e-mail service, client computers and a servercomputer are connected via the World Wide Web as depicted in FIG. 4. Auser subscribes to a White Pages or E-Mail service via a client computer270 operating a web browser 282 or other software application residingin memory 274 that allows it to display information downloaded from aserver computer 230 over the World Wide Web 260. The server computersystem accesses a database 240 containing contact information entered byregistered users. The service enables users to view contact informationentered by other users. The authorization scheme may allow all users tolimit certain classes of users from viewing certain parts of their userrecord as represented in FIG. 3. However, there are no linkages betweenindividual users and thus users cannot restrict the viewing of theirinformation on a user-by-user basis. Furthermore, users cannot benotified when information for particular users has changed.

SUMMARY

A networked computer system provides various services for assistingusers in locating, and establishing contact relationships with, otherusers. For example, in one embodiment, users can identify other usersbased on their affiliations with particular schools or otherorganizations. The system also provides a mechanism for a user toselectively establish contact relationships or connections with otherusers, and to grant permissions for such other users to view personalinformation of the user. The system may also include features forenabling users to identify contacts of their respective contacts. Inaddition, the system may automatically notify users of personalinformation updates made by their respective contacts.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and form a part ofthis specification, illustrate embodiments of the invention, wherein:

FIG. 1 depicts a computer loaded with Personal Information Managementsoftware;

FIG. 2 generally depicts the data schema of a category of prior artknown as groupware applications;

FIG. 3 shows a common scheme for authorizing permission to viewinformation in the prior art;

FIG. 4 depicts two computers interconnected via the Internet, one ofwhich is a server connected to a database and the other of whichrepresents a user's client workstation, both of which are configuredaccording to the prior art;

FIG. 5 depicts two computers interconnected via the Internet, one ofwhich is a server connected to a database and the other of whichrepresents a user's client workstation, both of which are configuredaccording to the present invention;

FIG. 6 represents an object model of the key tables in the relationaldatabase maintained on the server computer in the preferred embodimentof the present invention;

FIG. 7 represents a pseudo graphical user interface in which a userenters information in specific data fields to create a personal datarecord;

FIG. 8 represents a pseudo graphical user interface for listing otherusers with the same group affiliation as that specified by a first user;

FIG. 9 represents a pseudo graphical user interface for specifying whattype of data fields from a first user's personal data record to whichthe first user wishes to grant a specific second user access;

FIG. 10 represents a pseudo graphical user interface that displays theinformation stored in a user's personal address book;

FIG. 11 represents a pseudo graphical user interface that provides afirst user with specific information that has changed about the otherusers to which the first user is linked;

FIG. 12 represents a pseudo graphical user interface that allows a firstuser to enter travel information and find out which contacts haveoverlapping travel schedules

FIG. 13 represents a pseudo graphical user interface that allows a firstuser to gather information about the contacts of his contacts; and

FIG. 14 is a data flow diagram of an alternative embodiment of thepresent invention where a personal digital assistant is synchronizedwith a server database of user information.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Reference will now be made in detail to the preferred embodiments of theinvention, examples of which are illustrated in the accompanyingfigures. While the invention will be described in conjunction with thepreferred embodiments, it will be understood that they are not intendedto limit the invention to those embodiments. On the contrary, theinvention is intended to cover alternatives, modifications andequivalents, which may be included within the spirit and scope of theinvention as defined by the appended claims.

As represented in FIG. 5, the preferred embodiment follows a standardInternet architecture, in which client computers 370 and a servercomputer 330 are connected via the World Wide Web 360 and modems 338,378 or other communications channels. A user accesses the server 360 viaa client computer 370 operating a web browser 382 or other softwareapplication residing in memory 374 that allows it to display informationdownloaded from a server computer 330. The server computer system 330runs server software 342, including the network-computer-based personalcontact manager 343 of the present invention, which interacts with theclient computers 370 and a user information database 340. In acommercial embodiment of the present invention, the personal contactmanager 343 is the heart of a Web-based personal contact managementservice called PlanetAll. The database 340 contains contact informationentered by registered users. The personal contact manager 343 in somesituations will notify a set of users of updates made to the database340 by another user to whom the notified set is related.

The database 340 in is a relational database built from a set ofrelational tables 350. In the conventional manner, both the server 330and the clients 370 include respective storage devices, such as harddisks 336 and 376 and operate under the control of operating systems344, 384 executed in RAM 334, 374 by the CPUs 332, 372. The serverstorage device 336 stores program files 346 and the operating system348. Similarly, the client storage devices 376 store the web browsersoftware 386 and the operating systems 388. In an alternativeconfiguration, in which the client is a personal information manager(PIM), such as the U.S. Robotics Palm Pilot, the disc 376 can alsoinclude a local PIM database 390 and PIM software, which performs datamanagement and synchronization functions.

FIG. 6 outlines the data structure of the relational database 340 in thepreferred embodiment, in which seven tables 350 are employed to enablemost of the functionality of the system:

(1) Customer Table 440;

(2) Friend Table 460;

(3) Group Table 400;

(4) Affinity Table 420;

(5) Address Table 480;

(6) Phone Table 500; and

(7) Travel Event Table 520;

The Customer Table 440 contains one record for each unique user. The keyfield in this table is CustomerID 440-2. All information stored in thevarious database tables relating to a particular member is linkedtogether by a unique number in this field. Other important fields inthis table include information used by users to login to the system(Username 440-6 and Password 440-8), information which helps usersidentify each other (First Name 440-10, Last Name 440-12, and E-mail440-20), information required to provide Birthday Notification (Birthday440-16) and information required to provide Crossing Paths notification(CityID 440-14). Each record in the Customer Table 440 is time-stampedvia the RecordDate field 440-4. Other fields 440-22 can also be includedin the Customer Table 440 (and the other tables as well).

The Friend Table 460 relates users to each other. Each record in thetable represents a relationship between one user, identified byCustomerID 460-4, and another, identified by FriendID 460-6, with acertain level of permissions 460-10. The user interface of the systemprovides a multitude of ways for users to view information about otherusers, and every one of these ways relies on a database query of theFriend Table 460 to determine the list of other users whose informationa particular user may see. Each record is time-stamped via theRecordDate field 460-8 so that users may be notified when theircontacts' records change. Each record is uniquely identified by aRelationID 460-2.

The Group Table 400 contains one record for each unique group with whichusers may affiliate. Each group is identified by a GroupName 400-4 andGroupType 400-6. Examples of these groups would be GroupName400-4=“Massachusetts Institute of Technology” (GroupType=“University”)and GroupName 400-4=“Sigma Chi” (GroupType=“Fraternity”). Each recordhas a time-stamp 400-8 and a unique identifier 400-2.

Each record of the Affinity Table 420 relates a user, identified byCustomerID 420-4, to a group, identified by GroupID 420-6. If a useraffiliates with six groups, there would be six records in the AffinityTable 420. This table stores information about the time period of auser's affiliation with a particular group in the FromYear and ToYearfields 420-8, 420-10 so that the system may help users find theircontemporaries. Each record is time-stamped 420-12 so that the systemmay report to users when other users join the group, has a uniqueidentifier 420-2 and can include additional fields 420-14.

The Address Table 480 stores information for any number and kind ofaddresses for a particular user, identified by CustomerID 480-4. Forinstance, if a user wants to make his home address, work address andsummer home address available to his contacts, there would be threerecords for that user in the Address Table 480, each being identified inpart by an appropriate AddressType 480-8 (e.g., home, work, summerhome). Each record is time-stamped 480-16 so that the system can notifyusers when their contacts have added or modified address information andhas a unique identifier 480-2. Address information is conventional,including street Address 480-8, CityID 480-10, Postal code 480-12, andmilitary Base 480-14 fields.

The Phone Table 500 is directly analogous to the Address Table 480, butit stores telephone and fax number information instead of addressinformation. Each record is identified by a unique PhoneRecordID 500-2and includes the CustomerID 500-4 of the user whose phone information iscontained in the record, a phone type ID 500-6 indicating, e.g., whetherthe record is for a telephone or fax, the phone number 500-8 and atime-stamp 500-10.

The Travel Event Table 520 stores information about users' travel plans.This table is required to notify users when their travel plans intersectwith the travel plans of their contacts. A record in the Travel EventTable 520 includes the CustomerID 520-4 of the user whose travelinformation is contained in the record, arrival and departure dates520-6, 520-8 and a CityID 520-10 identifying the travel destination.Each record is uniquely identified by a Travel_EventID 520-2 and istime-stamped with a RecordDate 520-14.

In the preferred embodiment, a multitude of other tables 540 are used toenable a variety of user services. The Permission Type Table 542contains one record for each of the varieties of permission levels thesystem allows members to assign to their contacts in the Friend Table460. In the preferred embodiment, as illustrated in FIG. 9, permissioninformation is grouped into five categories for the purpose of userinterface simplicity (crossing paths notification permission 600-6,personal information 600-8, work information 600-10, birthdaynotification 600-12, and friends of friends information 600-14).However, the Permission Type table 542 could just as easily bestructured to allow members to grant and deny access to information on afield by field basis.

The City Table 550 stores latitude and longitude information for twomillion cities to enable the system to notify users when their contactstravel within a defined geographical radius. The Zodiac Table 552 allowsthe system to associate birthdays with signs of the Zodiac and therebynotify which of their contacts have compatible astrological signs on aparticular day. The AddressType, PhoneType and GroupType tables 544,546, 548 define the types of address, phone and group that can bedefined in the respective Address, Group and Phone tables 480, 400, 500.The advantage of this normalized relational database architecture isthat it permits scaling and speed far in excess of any embodiment of theprior art.

FIGS. 7 through 12 display pseudo software graphical user interfaces(GUIs). In the preferred embodiment, the web server software 342 on theserver computer 330 displays these GUIs via the computer communicationsinterface 360 on the user interface 380 of the user workstation computer370. The database and communications operations necessary to perform thedescribed functions are controlled by the personal contact manager 343,which employs where necessary the services of the web server software342. For example, the personal contact manager 343 updates the databasetables 350 when a user submits a new home address and then determineswhether any of that user's contacts need to be notified of the change.If so, the personal contact manager 343 will issue the notifications viathe web server software 342. It should be assumed, unless a statement tothe contrary is made, that all of the operations described herein whichare aspects of the present invention are embodied by the personalcontact manager 343.

Referring now to FIG. 7, a pseudo GUI 560 is shown that allows membersto enter information about themselves in order to create a personal datarecord. Users can enter information in this GUI in various data fields.In the preferred embodiment, these fields include: Name 560-2, HomeAddress 560-4, Home Phone 560-6, Work Address 560-8, Work Phone 560-10,Birthday 560-12, High School 560-14, Year of High School Enrollment560-16, High School Graduation Year 560-18, College 560-20, Year ofCollege Enrollment 560-22, and College Graduation Year 560-24.

In certain of these data fields, the user can specify groups with whichhe wishes to affiliate himself, and the beginning and ending dates ofthe affiliation. In the preferred embodiment, the data fields HighSchool 560-14 and College 560-20 represent categories of groups. In thedata field Year of High School Enrollment 560-16, the user enters thebeginning date of the affiliation with the group specified in the datafield High School 560-14. In the data field High School Graduation Year560-18, the user enters the ending date of the affiliation with thegroup specified in the data field High School 560-14. In the data fieldYear of College Enrollment 560-22, the user enters the beginning date ofthe affiliation with the group specified in the data field College560-20. In the data field College Graduation Year 560-24, the userenters the ending date of the affiliation with the group specified inthe data field College 560-20. In both of these cases, the beginningdate and ending date establish a date range during which time the userwas affiliated with the group in question.

Once the user of the client computer 370 (FIG. 5) enters information ineach data field in the GUI 560 shown in FIG. 7, he clicks the Submitbutton 560-26 (or performs some equivalent action) and the informationentered is transferred via the computer communications network 360 (FIG.5) to the server computer 330, where the server personal contact managersoftware 343 stores the information in the appropriate tables 350 of adatabase 340.

Referring now to FIG. 8, a pseudo GUI 580 is shown that allows a firstuser to select other users they wish to add to their personal addressbook. The list of contacts is created based on the group affiliationinformation the first user enters in the data fields College 560-20,Year of College Enrollment 560-22, and College Year of Graduation 560-24in the Pseudo Registration GUI 560 shown in FIG. 7. A similar GUI 580would exist for the group specified in the data field High School 560-14in the pseudo 560 GUI shown in FIG. 7.

In each version of the GUI 580 shown in FIG. 8, a text description 580-2at the top of the GUI explains to the first user that other members havebeen found who had the same affiliation as the first user during thesame period of time as the first user. The name 580-6 of the group inwhich the first and second users share an affiliation is displayed andthe date range 580-8 of the first user's affiliation with that group isdisplayed.

If a second user whose personal information is stored in the tables 350of the database 340 on the server computer 330 has specified the samegroup affiliation as that specified by the first user in the College560-20 data field, and that second user has specified a date range forthat affiliation that intersects with the date range specified by thefirst user in the Year of College Enrollment 560-22 and CollegeGraduation Year 560-24 data fields, the Name 580-10 of the second userand the ending date 580-12 of the second user's affiliation with thatgroup are displayed.

A second text description 580-4 at the top of the GUI 580 instructs thefirst user to select any of the second users listed whom the first userwishes to add to his personal address book. If the first user wishes toadd a second user to his personal address book, the first user clicksthe checkbox 580-14 to the left of the Name 580-10 (e.g., “John Doe”)for that second user. Once the first user has finished specifying theusers he wants to add to his address book, he clicks the Submit button580-16, and the information entered is transferred via the computercommunications network 360 to the server computer 330 where it is storedin the appropriate tables 350 of the database 340.

A pseudocode description of the actions performed by the personalcontact manager software 343 to display the group member list is shownin Appendix A. This pseudocode fragment (and the others that follow) iswritten in a structured English that is similar to computer languagessuch as Pascal, FORTRAN and C. The pseudocode fragments are notdescribed herein as they are self-explanatory. The tables and fieldsreferred to in the pseudocode fragments correspond to the tables andfields described in reference to FIG. 6.

Referring now to FIG. 9, a pseudo GUI 600 is shown allowing a first userto specify which types of data fields from the first user's personaldata record to grant a specific second user permission to view. If afirst user specifies a second user whom the first user would like to addto his personal address book, as explained in the description of FIG. 8,the second user will receive notification (issued by the contact managerprogram 343—FIG. 5) that the first user has “linked” to him. If thesecond user chooses to return the link to the first user, the systemwill display the pseudo GUI 600 shown in FIG. 9 with the name of thefirst user 600-5, allowing the second user to set data field permissionsfor the first user. Unlike the prior art, which does not allow the firstuser to specify data field permissions for individual other users, thedisclosed system allows the first user to specify permissions separatelyfor each individual other user in whose personal database the first userhas chosen to be included.

A text description 600-2 at the top of the pseudo GUI in FIG. 9instructs the first user to specify which types of data fields from thefirst user's personal data record to allow to appear in the personaladdress book of the second user, whose name 600-4 is shown below.Several types of data field permission are listed, each with a check boxto the left enabling the first user to select or deselect the permissiontype. For example, to grant the second user 600-4 permission to view theinformation from the first user's personal data record indicated by thepermission type denoted “Crossing Paths Notification Permission,” thefirst user would check the box 600-7 to the left of the permission typeCrossing Paths Notification Permission 600-6. To deny the second user600-4 permission to view the information from the first user's personaldata record indicated by the permission type denoted “PersonalInformation,” the first user would uncheck the box 600-9 to the left ofthe permission type Personal Information 600-8.

In the preferred embodiment of the present invention, the levels ofpermission are as follows: Crossing Paths Notification Permission 600-6,Personal Information 600-8, Work Information 600-10, BirthdayNotification 600-12, and Friends of Friends Information 600-14. However,the present invention is not limited to the levels of permission shownin the preferred embodiment. The present invention is flexible to allowpermission categories to be modified as needed.

Each permission type allows the second user to view information from thefirst user's personal data record in specific data fields, according toa specific set of rules. In the preferred embodiment of the presentinvention, these permission rules are as follows:

If member A links to member B, member A can grant any of the permissionsdiscussed below to member B.

Even if member B does not reciprocate the link to member A, an e-mailforwarding address for member B will be included in the Virtual AddressBook for member A. For example, the e-mail address“memberB@planetall.com,” which maps to the actual e-mail address thatmember B has entered into his/her own record, will appear in member A'sVirtual Address Book, but nothing else.

When member A first links to member B, member B is notified on the Website and in an e-mail.

If member B elects not to grant any permissions to member A, member Awill not appear in member B's Virtual Address Book.

If member B grants any permissions to member A, a listing in member B'sVirtual Address Book will be created for member A, and the listing willcontain whatever information member A has given permission for member Bto see.

If member B grants Personal Information 600-8 permission to member A,member B's home address and phone number (if available) will appear inmember A's Virtual Address Book and member A will be informed whenmember B changes the relevant information in his/her own listing.

If member B grants Work Information 600-10 permission to member A,member B's work address and phone number (if available) will appear inmember A's Virtual Address Book and member A will be informed whenmember B changes the relevant information in his/her own listing.

If member B grants Crossing Paths Notification Permission 600-6 tomember A, member A will be able to be informed when member B will be inthe same city as member A. If member A and member B are both based inthe same city, member A will only be informed when member A and member Bare traveling to the same destination.

If member B grants Birthday Notification 600-12 permission to member A,member B's birthday and anniversary (if available) will appear in memberA's Virtual Address Book and member A will be notified when member B'sbirthday or anniversary are approaching.

If member B grants Friends of Friends Information 600-14 permission tomember A, if member A searches for information about the contacts ofhis/her contacts, such as who lives in a particular city or isassociated with a particular group, information from member B's circleof contacts will be included in the search results, if applicable.

Either member can modify permissions at any time. Either member candelete the other member as a contact at any time.

Pseudocode descriptions of the actions performed by the personal contactmanager software 343 to display address information of contacts and toperform birthday and address change notifications are shown inAppendices B, C and D, respectively. Each of these operations depends onwhich permissions respective users have been granted by the owner of theinformation.

Once the first user has finished specifying the data field permissionsfor the second user 600-4, he clicks the Submit button 600-16 and theinformation entered is transferred via the computer communicationsnetwork 360 to the server computer 330 where it is stored in theappropriate tables 350 of the database 340 (see FIG. 5). A pseudocodedescription of the actions performed by the personal contact managersoftware 343 to enable a user to change the permissions of contacts isshown in Appendix H.

Referring now to FIG. 10, a pseudo GUI 618 that displays the informationstored in a user's personal address book is shown. The information in auser's personal address book is stored in the appropriate tables 350 ofthe database 340 on the server computer 330, to which the clientcomputer 370 is connected via the world wide web 360 (see FIG. 5). Theinformation in each user's personal address book is customized for thatuser, as described below. Each first user's personal address bookcontains information about each second user who has given the first userpermission to view information in the second user's personal data record636. Which categories of each second user's information are displayed inthe first user's personal address book is controlled completely by thesecond user, as explained in the description of FIG. 9. In addition,each second user's information is entered and maintained completely bythe second user (e.g., “Donald Tully”), as explained in the descriptionof FIG. 7.

FIG. 10 illustrates the Address Book pseudo GUI 620 at three levels, inwhich each next level allows the user to view progressively more detailabout the contacts in his personal address book.

In level 1 620 of the pseudo address book GUI 618, each letter of thealphabet is shown 622. By clicking on any letter of the alphabet 622, afirst user can display a listing of the contacts whose last names beginwith the letter of the alphabet selected, and about whom information isstored in the first user's personal address book. This information isdisplayed in the level 2 626 of the pseudo address book GUI. Forexample, if the first user clicks on the letter □T□ 624 in level 1 620of the pseudo address book interface, all contacts whose last namesbegin with the letter T and about whom information is stored in thefirst user's personal address book will be displayed 628 in level 2 626of the pseudo address book GUI.

In level 2 626 of the pseudo address book GUI, a listing of the secondusers whose last names begin with the letter of the alphabet selected inlevel 1 620 of the pseudo address book GUI, and about whom informationis stored in the first user's personal address book, is shown. Byclicking on any second user's name, the first user can display theinformation about that second user stored in the first user's personaladdress book. This information is displayed in level 3 632 of the pseudopersonal address book GUI. For example, if the first user clicks on thesecond user name “Tully, Donald” 630, the information pertaining toDonald Tully stored in the first user's personal address book will bedisplayed in level 3 632 of the pseudo address book GUI.

In level 3 632 of the pseudo address book GUI, information 634 is shownabout a specific second user that is stored in a first personal addressbook. Only the categories of information from the second user's personaldata record that the second user gave the first user permission to vieware displayed. The second user's information is entered and maintainedcompletely by the second user.

In the preferred embodiment of the present invention, the second user'se-mail address 634-2 is displayed if the second user gave the first userany type of data field permission. The second user's work address andphone number 634-4 are displayed only if the second user gave the firstuser Work Information permission. The second user's home address andphone number 634-6 are displayed only if the second user gave the firstuser Personal Information permission. The second user's birthday andbirth year 634-8 are displayed only if the second user gave the firstuser Birthday Notification permission. These permission rules are simplyexamples from the preferred embodiment. The present invention is notlimited to the permission rules used in the preferred embodiment.

A pseudocode description of the actions performed by the personalcontact manager software 343 to display the address book listing isshown in Appendix B.

Referring now to FIG. 11, a member update pseudo GUI 650 is shown. Thispseudo GUI 650 provides a first user with specific information that haschanged about the other users to which the first user is linked, plusnew information about contacts to whom the first user may wish to link.The information displayed in a user's member update is stored in theappropriate tables 350 of the database 340 on the server computer 330,to which the client computer 370 is connected via the world wide web360. The member update pseudo GUI 650 is automatically displayed on theuser interface 380 of the user workstation 370, at an interval preset bythe user. For example, FIG. 11 displays a hypothetical member update650-2 released on Dec. 7, 1998. The information displayed in the datafields below is information that has changed between Dec. 7, 1998 andthe date of the previous update, the interval between which has beenpreviously specified by the user. The information shown in each user'smember update is customized for that user, as described below.

In a first portion of the member update pseudo GUI 650 shown in FIG. 11,if one or more of the second users who have linked to a first user andhave provided Birthday Notification permission to the first user haveupcoming birthdays, a text description 650-4 alerts the first user ofthe upcoming birthday(s). The names and birthdays 650-6 for those secondusers are listed below. In the preferred embodiment of the presentinvention, the first user will receive this notification 2 weeks, 1week, 2 days, and 1 day in advance of a particular upcoming birthday,and on the actual date of the birthday. The first user does not need tocollect and input the birthday dates for each second user who has linkedto the first user. Each second user's birthday information is enteredand maintained completely by the second user, as shown in the Birthdayfield 560-12 of FIG. 7, the registration form pseudo GUI 560.

In another portion of the member update pseudo GUI shown in FIG. 11, ifone or more of the second users who have linked to the first user andhave provided Personal Information permission or Work Informationpermission to the first user have changed their work or home address, atext description 650-8 alerts the first user. If a second user haschanged his work address information and has given the first user WorkInformation permission, the second user's new work address information650-10, 650-12 is displayed. If a second user has changed his homeaddress information and has given the first user Personal Informationpermission, the second user's new home address information is displayed.

Each second user's address information is entered and maintainedcompletely by the second user, as shown in the registration form pseudoGUI 560 of FIG. 7. After changing his address information in hispersonal data record, the second user does not need to specify that thenew address information be provided to each first user to whom he haslinked and given the proper form of data field permission. The newaddress information is provided to each first user quickly andautomatically. In addition, the architecture of the present invention isscalable to include millions of users.

In another portion of the member update pseudo GUI 650 shown in FIG. 11,if one or more members has affiliated with a group with which the firstuser is also affiliated, a text description 650-14 will alert the firstuser. The name of the second user, the name of the group in which thefirst and second users share an affiliation, and the ending date of thesecond user's affiliation with that group are displayed 650-16.

This portion of the registration form pseudo GUI 650 functions similarlyto the group list form pseudo GUI shown in FIG. 8. If a new second userwho fills out a registration form such as the pseudo GUI in FIG. 7, andtherefore whose personal information is stored in the tables 350 of thedatabase 340 on the server computer 330 has specified the same groupaffiliation as that specified by the first user in the College 560-20data field, and that second user has specified a date range for thataffiliation that intersects with the date range specified by the firstuser in the Year of College Enrollment 560-22 and College GraduationYear 560-24 data fields, the Name of the second user and the ending dateof the second user's affiliation with that group 650-16 are displayed.Similarly, if the first user and the new second user were affiliatedduring an intersecting period of time with the group specified in thedata field High School 560-14 in the pseudo GUI 560 shown in FIG. 7, theName of the second user and the ending date of the second user'saffiliation with that group 650-16 are displayed.

A pseudocode description of the actions performed by the personalcontact manager software 343 to display a list of service members whohave recently joined a user's groups (i.e., members who are not currentcontacts of the user) is shown in Appendix E.

If the first user wishes to add contact information to his personaladdress book for any of the second users listed 650-16, the first usercan do so in a GUI similar to the group list form pseudo GUI 580 shownin FIG. 8. Each second user to whom the first user has initiated a linkwill then be informed of the link, and can then return the link andspecify data field permissions for the first user, if any, as explainedin the description of FIG. 9.

A pseudocode description of the actions performed by the personalcontact manager software 343 to identify people who have linked to aparticular user are shown in Appendix F.

In another portion of the member update pseudo GUI 650 shown in FIG. 11,if a second user has initiated a link to a first user, the first userwill be automatically notified 650-18 that a link has been made. Foreach second user that has initiated a link, the user's name 650-20 isshown. If the first user wishes, the first user can then return the linkand specify data field permissions for the second user, if any, asexplained in the description of FIG. 9.

Another section 650-22 of the member update pseudo GUI 650 shown in FIG.11 is used to inform a first user when the travel plans he has enteredinto the system overlap with the travel plans that any of his contactshas entered into the system, as long as the contact has granted thefirst user Crossing Paths Notification permission.

This system, termed “Crossing Paths Notification” in the preferredembodiment of the present invention, operates as follows. The home cityor “base city” for each user is determined from information entered bythat user in the Home Address data field 560-4, as explained in thedescription of FIG. 7. The “City” table 550 (FIG. 6) stored on theserver computer 330 includes 1.7 million names of cities around theworld. Each of these cities is associated with a precise latitude andlongitude. If the user's base city cannot be matched to a city in the“City” table, the user can add the new city to the “City” table bygiving the name of another city that is already in the “City” table thatis nearby the user's base city. The user's base city is assigned thesame latitude and longitude as the existing city. This information isused to associate each user with a precise longitude and latitude, anddetermine all cities within a 29-mile radius of the user's base city.

Whenever a user is planning to travel, he can specify the dates duringwhich he will be away and the city he will be visiting. If a second userhas granted a first user Crossing Paths Notification permission, and thefirst user has entered a Travel Event to a city that is within a 29-mileradius of the base city of the second user, the first user will benotified 650-22 (FIG. 11) that he will be crossing paths with the seconduser 650-24 (e.g., “Andrew Kress”), as long as the second user has notalso scheduled a travel event for the same time period. In anotherscenario, if a second user has granted a first user Crossing PathsNotification permission, and the first user has entered a travel eventto a city that is within a 25-mile radius of a city to which the seconduser has scheduled a travel event during the same time period, the firstuser will be notified 650-22 that he will be crossing paths with thesecond user 650-24. Travel events are described more fully in referenceto FIG. 12.

The Crossing Paths Notification system is able to handle multiple citiesin a single day. For instance, if a first user lives in Boston but istraveling to New York on March 5, then the first user will be informedif any contacts will be crossing paths on that day in either city. Inaddition, this system is scalable to millions of users. A pseudocodedescription of the actions performed by the personal contact managersoftware 343 to enable a user to receive crossing paths notification isshown in Appendix I.

The final section 650-26 of the member update pseudo GUI 650 shown inFIG. 11 is used to inform a first user which of his contacts has anastrological sign compatible with that of the first user on the date ofthe member update. Each member is associated with one of the twelveastrological signs based on the information he entered in the Birthdaydata field 560-12 in the registration form pseudo GUI 560 shown in FIG.7. Each day of the year is mapped to one of these twelve signs. Thisinformation is stored in the appropriate table 350 in the database 340on the server computer 330. On a given day, all of a member's contactswho are associated with “sign of the day” are deemed to be compatiblewith the member. Only the names of contacts who have given the firstuser Birthday Notification permission will be shown in the member updatepseudo GUI for the first user. A pseudocode description of the actionsperformed by the personal contact manager software 343 to enable a userto receive notification of compatible contacts is shown in Appendix J.

The permission rules used in reference to FIG. 11 are simply examplesfrom the preferred embodiment. The present invention is not limited tothe permission rules used in the preferred embodiment.

Referring now to FIG. 12, a pseudo Add Travel Form GUI 660 and a pseudoCrossing Paths List GUI 670 are shown. These two screens are used in theCrossing Paths Notification System. If a first member is planning atrip, the first member can use the pseudo Add Travel Form GUI 660 to adda Travel Event, in which he specifies the location 660-2, 660-4, 660-6,dates 660-8, 660-10, and contact information 660-20 for the intendedtrip. In the pseudo Crossing Paths List GUI 670, the first member isinformed which of the second members to whom he is linked and who havegranted him Crossing Paths Permission will be in the vicinity of thecity to which the first user is travelling, during the time period ofthe specified Travel Event. The first user can then use the pseudoCrossing Paths List GUI 670 to select which of the displayed secondusers the first user would like to inform of the first user's specifiedTravel Event.

The pseudo Add Travel Form 660 is displayed on the user interface 380(FIG. 5) of a user's client computer 370 when the user chooses toschedule a Travel Event. The user enters information about his scheduledtrip in the data fields shown. In the Traveling To City field 660-2, theuser enters the name of the city to which he is traveling. In the Statefield 660-4, the user enters the name of the state in which is locatedthe city to which he is traveling. In the Country 660-6 field, the userenters the name of the country in which the city to which he istraveling is located. The information entered in these three fields660-2, 660-4, 660-6 is used to locate the city for the Travel Event inthe City table 550 on the server computer 330. The exact latitude andlongitude of the Travel Event city is then determined and a list iscreated of all cities located within a 25-mile radius of the TravelEvent city. In the Arrive in City on Date field 660-8, the user entersthe first date on which he will be in the Travel Event city. In theLeave City on Date field 660-10, the user enters the date beginning onwhich he will no longer be in the Travel Event city. The informationentered in these two fields 660-8, 660-10 is used to determine the daterange for the Travel Event. Finally, in the How to Get in Touch While inThis City data field 660-20, the user enters the method for contactinghim during the Travel Event. After the user has finished enteringinformation in the pseudo Add Travel Form GUI (12-1), the informationentered is stored by the personal contact manager 343 in theTravel_Event table 520 on the server computer 330.

The pseudo Crossing Paths List 670 is displayed on the user interface380 of the first user's client computer 370 after a first user hasscheduled a Travel Event using the pseudo Add Travel Form 660. A textmessage 670-2 issued by the personal contact manager 330 informs thefirst user that one or more of his contacts will be in the same city asthe first user during the first user's scheduled Travel Event. Thosecontacts (e.g., Scott Ulem, Taylor Pierce, Betsy Klein) who live in thecity of the first user's scheduled Travel Event are listed 670-6, aswell as those contacts (e.g., Tania Gutsche) who will be visiting thecity of the first user's scheduled Travel Event 670-8. The contactslisted in the field 670-6 are those second users who have granted thefirst user Crossing Paths Permission, and who have listed in the HomeAddress field 560-4 (FIG. 7) of their Personal Data Record the city ofthe first user's scheduled Travel Event, or any city within a 25-mileradius of the first user's scheduled Travel Event. The contacts listedin the field 670-8 are those second users who have granted the firstuser Crossing Paths Permission, and who have scheduled a Travel Event tothe city of the first user's scheduled Travel Event, or any city withina 25-mile radius of the first user's scheduled Travel Event, during thedate range of the first user's scheduled Travel Event. For each contactname listed in both fields 670-6, 670-8, the first user can choose toinform that contact of the first user's scheduled Travel Event byclicking on the checkbox to the left of that contacts name. When thefirst user is finished selecting contacts, he then clicks the Submitbutton 670-10, which copies the information entered to the servercomputer (5-45) to be stored in the tables 350 by the networked personalcontact manager 343. For each second user whom the first user selected,the second user is informed, in a screen similar to the pseudo MemberUpdate GUI shown in FIG. 11, of the first user's Travel Event and themeans of contacting the first user 660-20 during the Travel Event.

Referring now to FIG. 13, a diagram illustrating the Friends of Friendssystem is shown. The Friends of Friends system allows a first member tosearch for the names of contacts of their contacts who live in the samecity as the first member or are affiliated with a group with which thefirst member is also affiliated. When a first user performs a Friends ofFriends search, the personal contact manager 343 displays, via the webserver software 342, the results of the search on the user interface 380(FIG. 5) of the first user's client computer 370 in a GUI similar to thepseudo Friends of Friends report GUI 688. After locating a second memberwho is a friend of a friend, the first member can then link to thatsecond member in order to add the second member to the first user'sPersonal Address Book, as explained in the descriptions of FIG. 8 andFIG. 9 above.

In the preferred embodiment of the personal contact manager 343, theFriends of Friends system operates as follows. If a Member A 680 islinked to a Member B 682 with any level of permissions 681 and theMember B 682 is linked to a Member C 684 with any level of permissions685, then if Member C 684 grants to Member B 682 Friends of Friendspermissions 687 and Member B 682 also grants to Member A 680 Friends ofFriends permissions 683, then Member A is eligible to receive Friends ofFriends notification about Member C. When a first user performs aFriends of Friends search, the results of the search will include allsecond users who have affiliated themselves with a group with which thefirst user is affiliated and all second users who live in the same cityin which the first user lives, so long as the first user is eligible toreceive Friends of Friends notification about those second users, asdescribed above. For example, if Member A and Member C both belong toGroup A 686, and Member A is eligible to receive Friends of Friendsnotification about Member C, then the result of Member A's Friends ofFriends search 688 generated by the personal contact manager 343 willinclude Member C 690.

A pseudocode description of the actions performed by the personalcontact manager software 343 to perform a search for friends and friendsof friends in a specific city is shown in Appendix G.

The present invention is not limited to the search criteria or levels ofseparation in the preferred embodiment. The database architecture in thepresent invention is flexible to allow searches to be extended to morethan one degree of separation. For instance, it would be possible to adda Friends of Friends of Friends search feature. The architecture is alsoflexible to allow new search criteria to be added.

Referring to FIG. 5, in each of the embodiments described above, theuser information is stored on the server 330 and all user access to theuser information is mediated by a client web browser 382, the web serversoftware 342 and the server personal contact manager software 343. In analternative embodiment, which is configured for personal informationmanagers (PIMs), such as the U.S. Robotics Palm Pilot, a user is able tosynchronize their user information and their PIM database 390 through animportation/synchronization function performed by the personal contactmanager software 343. The synchronization operation can be performed ineither direction (i.e., client to server or server to client). Theserver personal contact manager software 343 will then use the webserver software 342 to communicate with the PIM software 392 of theuser's contacts, if applicable, and, in accordance with the permissionscheme already described, synchronize the databases 390 in the contacts'PIMs. All database, personal contact management and linking operationsalready described are operable in the alternative embodiment, except theGUIs might be different, depending on the graphical capabilities of theclient 370 running the PIM program 392. Thus, the alternative embodimentallows full synchronization of PIMs and the server database 340.

A data flow diagram illustrating the operation of the alternativeembodiment is shown in FIG. 14. In the illustrated situation a user Asubmits an address change from their client computer 370A. In responseto the update, the personal contact manager 343 running on the server330 updates user A's address information in the server database 340 (notshown) and issues an update notification to the client computer 370Bused by user B, who is a contact of user A. This alternative embodimentassumes that user B has a PIM (also referred to as a personal digitalassistant or PDA) that they would like to synchronize with the serverdatabase 340. In such a case PIM Software 392 running on the client 370Bperforms the synchronization operation based on the user A addressupdate information provided by the server 330. Following thesynchronization operation, the PDA database 390 has the same informationfor user A as the server database 340. Alternatively, the PDA 750 can becoupled directly to the Internet (indicated by the dashed line), inwhich case it operates substantially as a typical client computer 370described in reference to FIG. 5. However, one difference is that thePDA 750 maintains its own database 390 instead of relying solely on theserver database 340.

While the present invention has been described with reference to a fewspecific embodiments, the description is illustrative of the inventionand is not to be construed as limiting the invention. Variousmodifications may occur to those skilled in the art without departingfrom the true spirit and scope of the invention as defined by theappended claims.

APPENDIX A Display Group Member List

Submit group name.

Match group name to GroupID in Group table.

Join Affinity table to Customer table and CustomerPrefs table based onCustomerID.

Show contact information from Customer and CustomerPrefs tables when theAffinity table contains a record matching the CustomerID to thespecified GroupID.

APPENDIX B Display Address Book Listing   If MemberFriend AND aReciprocated Link then     If have Personal or Professional Permissionsthen       Show person's real email address.     else       Showperson's PlanetAll address.     end if     If have Personal Permissionand Biography Exists then       Show Biography.     end if   If (havePersonal or Professional Permissions) AND universal resource locator(URL) exists then     Show URL.   end if   If (Person is visible ingroup and Group Perms > 0) AND you have Common Groups then     Show thegroups you have in common.   end if   If Person is in one of more ofyour personal email lists then     Show the lists the person belongs to.  end if   If have Personal Permissions and Phone Type is one ofpersonal phone types then     Show phone.   end if   If haveProfessional Permissions and phone type is one of professional phonetypes then     Show phone.   end if   If have Personal Permissions andaddress Type is one of personal address types then     Show address.    if address is in USA then       Show map link.     end if   end if  If have Professional Permissions and address type is one ofprofessional address types then     Show address.     if address is inUSA then       Show map link.     end if   end if   If have ProfessionalPermissions and Professional Info Exists then     Show the professionalinfo the person has entered.   end if   If have Occasions Permissionsand Birthday exists then     Show the contact's birthday.   end if   Ifhave Occasions Permissions and Anniversary exists then     Show thecontact's Anniversary.   end if   If contact has entered spouse's namethen     Show spouse's name.   end if   If contact has entered selfdescription then     Show self description.   end if else ifMemberFriend AND a Non-Reciprocated Link then   Show message person hasnot linked back and give link so person can   email the unlinked personto tell them they have linked to them. (after   com/ASP rewrite will notshow email so spammers can't make lists). end if

APPENDIX C Birthday Notification

Birthdays are determined by the DayOfYear field in the customers table.

-   Create a list of all my contacts:    -   Go to the Friend table and select all Customers where        FriendID=my CustomerID.-   For each of my contacts, check to see if the DayOfYear is within    seven days of the current DayOfYear.-   Select the DayOfYear from the Customers table for all of the    customers in my list of contacts.-   If the DayOfYear is within seven days of the current DayOfYear, then    select the name of the customer.-   Display the names of all my contacts who have birthdays in the next    seven days.

APPENDIX D Address Change Notification

To determine which of a member's contacts' addresses have changed:Create a list of all my contacts:

-   -   Go to the Friend table and select all Customers where        FriendID=my CustomerID.        Find out which of these contacts have changed their addresses:    -   Link the Customers table and find records for my contacts where        AddressID is greater than the lowest Address ID having a date        greater than the date on which my last email update was sent.        Find out which of these contacts have given me permission to see        the address information that has changed:    -   Make sure that the appropriate permission appears in the record        in the friend table linking me to the contact.        Display information for these contacts.

APPENDIX E Show New Group Members

Create a list of all my groups:

-   -   Go to the affinity table and select all the records for my        CustomerID Select the GroupID for each of the records.    -   Do not include other customers' private groups to which I have        been added For each of my affinity records, check to see that        Group Perms are >0.        Create a list of all my contacts:    -   Go to the Friend table and select all Customers where        FriendID=my CustomerID.        Create a list of people who joined my groups:    -   Go to the affinity table and select all the affinity records for        my groups.    -   Select only affinity records for customers who joined the group        after I joined.        -   Select affinity records where the date of the record is            after the date for my affinity record in the same group.        -   Select only affinity records for people who joined the            groups after my last email was sent.        -   Select affinity records where the date of the record is            after my Sent date in the Email table.    -   Do not include people that are in my list of contacts:        -   Select only affinity records where the CustomerID is not            included in the list of all my contacts.    -   Select the CustomerID from each affinity record in the list of        people who joined my groups.    -   Go to the Customers table to find the name of each customer who        joined my groups.

APPENDIX F People Who Have Linked To You

Linking the Friends table and the Customers table based on theCustomerID field, select the following information from the two tables:

-   -   CustomerID from the Friends table.    -   First Name from the Customers table.    -   Last Name from the Customers table.    -   Record Date from the Friends table.    -   Permission level from the Friends table.        Where my CustomerID is not among the CustomerIDs found in the        following search:

CustomerID in the Friends Table is my CustomerID

AND the Record Date from the Friends table is within the last 30 daysAND I haven't already linked to the person

APPENDIX G Search for Friends of Friends in a Particular City

Specify City. Match to CityID in City table.Create a list of all my contactsGo to the Friend table and select all Customers where FriendID=myCustomerIDMake a temporary table linking the Friends table to itself calledFriend_(—)1 and establish the following relationships:

-   CustomerIDs for the contacts of my contacts appear in the Customer    field of the Friends table-   CustomerIDs for my contacts appear in the Friend field of the    Friends table-   CustomerIDs for my contacts also appear in the Customer field of the    Friends_(—)1 table (this is how the tables are joined)-   My Customer ID appears in the Friend field of the Friend_(—)1 table-   The Friend and Friend_(—)1 tables are joined on t    Show information for the contacts of my contacts (i.e. the Customers    from the Friends table) where the following conditions are true:    -   The Friends of Friends permission was granted from the contacts        of my contacts to my contacts.    -   The Friends of Friends permission was granted from my contacts        to me.    -   The contact does not already appear in the list of all my        contact created above.    -   The city for the contact of my contact matches the specified        city.

APPENDIX H Change Permissions

Join the Customer table to the Friend table based on CustomerID.Create a list of all my contacts:

-   -   Go to the Friend table and select all Customers where        FriendID=my CustomerID.        Show First Name and Last Name for my contacts from the Customer        table.        Allow me to pick a name from this list as the contact whose        permissions I would like to change.        Display the permission level that I have given this contact. It        is stored as the PermissionType field in the Friend table.        Allow access to the PermissionType for this record in the Friend        table.

APPENDIX I Crossing Paths Notification

Create a list of all my contacts:

-   -   Go to the Friend table and select all Customers where        FriendID=my CustomerID.        Create a list of all my contacts' travel events:    -   Go to the Queue Travel Event table and select all QueueIds where        the CustomerID is in my list of contacts.    -   Do not include trips for people who linked to me but did not        give me crossing paths permission:        -   Check the permissions field in the Friend table for each of            my contacts to see if I have crossing paths permissions.    -   Do not include trips if my contact specified that I should not        be informed:        -   For each of my contacts' trips, check the Travel Exception            table to see if my CustomerID is included in the list of            people who should not be informed of the trip.            Create a list of my location for the next seven days:    -   Select the arrival date, departure date, and city for all my        trips in Queue Travel Event for the next seven days.    -   For days when I am not traveling, select my city from the        customers table.        Select from the list of my friends' trips, all the trips to        cities that are within 3000 latitude and 3000 longitude to my        location for each of the next seven days.        Go to the Customers table and find the names of all the people        with whom I will be crossing paths.        Select first name and last name from the customers table for all        the CustomerIDs in the list of my contacts trips

APPENDIX J Compatible Contacts

Create a list of all my contacts:

-   -   Go to the Friend table and select all Customers where        FriendID=my CustomerID.        Determine my Zodiac sign:    -   Select my DayOfYear from the Customers table.    -   Select the Zodiac sign from the Zodiac table where my DayOfYear        is between the DayFrom and DayTo fields.        Determine my compatible Zodiac sign for today:    -   Go to the Horoscope table and select the Compatible field from        the row for my Zodiac sign and today's date.        Find my compatible contacts for today:    -   Select the DayFrom and DayTo fields from the Zodiac table for my        compatible zodiac sign.    -   Select my contacts from the list of all my contacts whose        DayOfYear is between the DayFrom and DayTo fields for my        compatible sign.

1. A system, comprising a server system that provides functionality forusers to register with a service, and to selectively establish contactrelationships with other registered users of the service such that eachregistered user can have one or more contacts, the server systemadditionally providing functionality for the registered users to supplyand update personal data for viewing by their respective contacts; acomputer data repository maintained by the server system, said computerdata repository storing said personal data supplied by the registeredusers, and storing relationship data that specifies said contactrelationships established between the registered users; and anapplication program that executes on the server system, said applicationprogram operative to cause the server system to use the relationshipdata to generate, for a first registered user, a list of contacts of thefirst registered user, and to make said list available to the firstregistered user such that the first registered user can select a contactfrom said list to view at least some of the personal data of theselected contact.
 2. The system of claim 1, wherein the server system isoperative to generate notification messages to notify the firstregistered user of personal data updates made by the contacts of thefirst registered user.
 3. The system of claim 1, wherein the serversystem an option for each registered user to specify, on acontact-by-contact basis, which elements of the personal data of therespective registered user are viewable via the service.
 4. The systemof claim 1, wherein the server system is responsive to a request by thefirst registered user to establish a contact relationship with a secondregistered user by notifying the second user of said request, and byproviding an option for the second user to respond to the request bytaking an action to cause a two-way contact relationship to beestablished with the first user.
 5. The system of claim 1, wherein theserver system is responsive to a second registered user establishing acontact relationship with a third registered user by sending anotification message to the third user by email to notify the third userof establishment of said contact relationship.
 6. The system of claim 1,wherein the server system provides an option for registered users tospecify affiliations with organizations, and uses the said affiliationsto communicate, to a user who is affiliated with a first organization,information identifying other users who are affiliated with the firstorganization, the server system thereby facilitating discovery of otherusers with which to establish contact relationships.
 7. The system ofclaim 1, wherein the server system provides an option for eachregistered user to specify a school attended and a date range ofattendance, and the server system is operative to use resulting schooland date range information to identify, and inform a second registereduser of, other registered users that attended the same school as thesecond registered user at the same time as the second registered user,the server system thereby facilitating discovery of users with which toestablish contact relationships.
 8. The system of claim 1, wherein theserver system uses personal data supplied by the registered users toidentify, and inform a second registered user of, other registered userswho are share a common user attribute with the second registered user.9. The system of claim 1, wherein the application program isadditionally operative to use the relationship data to notify users ofbirthdays of their respective contacts.
 10. The system of claim 1,wherein the server system is operative to use the relationship data todetect, and to notify a second user that, a third user is a contact of acontact of the second user.
 11. The system of claim 1, wherein theserver system hosts a web site that provides web-based user access tothe service.